A new route for separation and recovery of Fe, Al and Ti from red mud

Li, Siwei; Pan, Jian; Zhu, Deqing; Guo, Zhengqi; Shi, Yanchao; Dong, Tao; Lu, Shenghu; Tian, Hongyu

doi:10.1016/j.resconrec.2020.105314

Cited by 45 publications

(13 citation statements)

References 28 publications

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“…The pre-reduction-smelting separation procedure used for the SSS preparation was described in detail in the reference [21]. The experimental owsheet is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous work, Al-enriched slag from RM was successfully prepared through pre-reducing-smelting separation, and it can be used as a feed for extracting Al 2 O 3 [21]. In this work, we aim to nd a novel process to treat Al-enriched slag e ciently.…”

Section: Countrymentioning

confidence: 99%

“…Based on our previous study, pre-reducing-smelting separation was performed to recover iron from RM (reducing temperature at 1200 ℃, smelting separation at 1600 ℃ with 0.7 basicity), and we simultaneously obtained smelting separation slag (SSS) [21]. The chemical composition of SSS is shown in Table 2.…”

Section: Smelting Separation Slagmentioning

confidence: 99%

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Extracting Al2O3 from red mud smelting separation slag based on mineral phase reconstruction

Guo

Pan

et al. 2023

Preprint

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Recovery of valuable metals from red mud smelting separation slag is important for environmental protection and saving of natural resources. In this paper, we propose a recycling process of red mud smelting separation slag by mineral phase reconstruction conducted under an air atmosphere. In this process, NaOH and Ca(OH)2 roasting of Al2O3 and NaAlSiO4 was performed, and Al2O3 and SiO2 were converted into alkaline-soluble NaAlO2 and Ca2SiO4, respectively. In the consequent steps, more than 80% of Al2O3 was selectively dissolved into a leaching solution using a NaOH solution under 95℃, and the obtained NaAlO2 solution can be used as a source for extracting alumina. Then, a 20 wt.% HCl solution was used to remove SiO2 from the residue, obtaining a SiO2-containing solution and a concentrated residue of undissolved TiO2 and CaO. Finally, this mineral phase reconstruction process can enable a higher metal leaching rate, and this study provides a novel, clean, and sustainable method for recycling valuable metals from red mud smelting separation slag.

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“…The pre-reduction-smelting separation procedure used for the SSS preparation was described in detail in the reference [21]. The experimental owsheet is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Section: Countrymentioning

confidence: 99%

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Extracting Al2O3 from red mud smelting separation slag based on mineral phase reconstruction

Guo

Pan

et al. 2023

Preprint

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“…Li et al [142] collected red mud from Shandong Province, China; the sample was pre-dried at 100 • C for 10 h to remove moisture. The chemical composition is given in Table 4.…”

Section: China 421 Case Studymentioning

confidence: 99%

Red Mud as a Secondary Resource of Low-Grade Iron: A Global Perspective

et al. 2022

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Managing red mud (RM), a solid waste byproduct of the alumina recovery process, is a serious ecological and environmental issue. With ~150 million tons/year of RM being generated globally, nearly 4.6 billion tons of RM are presently stored in vast waste reserves. RM can be a valuable resource of metals, minor elements, and rare earth elements. The suitability of RM as a low-grade iron resource was assessed in this study. The utilization of RM as a material resource in several commercial, industrial operations was briefly reviewed. Key features of iron recovery techniques, such as magnetic separation, carbothermal reduction, smelting reduction, acid leaching, and hydrothermal techniques were presented. RMs from different parts of the globe including India, China, Greece, Italy, France, and Russia were examined for their iron recovery potential. Data on RM composition, iron recovery, techniques, and yields was presented. The composition range of RMs examined were: Fe2O3: 28.3–63.2 wt.%; Al2O3: 6.9–26.53 wt.%; SiO2: 2.3–22.0 wt.%; Na2O: 0.27–13.44 wt.%; CaO: 0.26–23.8 wt.%; Al2O3/SiO2: 0.3–4.6. Even with a high alumina content and high Al2O3/SiO2 ratios, it was possible to recover iron in all cases, showing the significant potential of RM as a secondary resource of low-grade iron.

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“…Red mud contains SiO 2 , A1 2 O 3 , Fe 2 O 3 , CaO, and silicate minerals necessary for the mass production of cement, as well as a certain amount of amorphous aluminosilicate substances, which can react with water to hydrate [ 22 , 23 , 24 , 25 ]. In addition, the aluminosilicate in red mud undergoes a pozzolanic reaction under the action of Ca(OH) 2 released during cement hydration and is a potentially active cementitious material [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Resource Utilization of Red Mud from the Solid Waste of Aluminum Industry Used in Geothermal Wells

Wu¹,

Gao

et al. 2022

Materials

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It is difficult for the commonly used Class G oil well cement to withstand the high-temperature environment of geothermal wells, and it is easy to deteriorate the mechanical properties and damage the integrity of the cement sheath. Industrial solid waste red mud can be used as supplementary cementing materials (SCMs) to improve its mechanical properties at high temperatures. In addition, compared to Class G oil well cement, high belite cement (HBC) has lower energy consumption and better mechanical properties at high temperatures. In this study, the mechanical properties of HBC as a gel material and quartz sand and red mud as SCMs were studied at high temperatures. The ratio of HBC to SCMs and the ratio of quartz sand to red mud in SCMs were optimized using the response surface method (RSM). The response surface was established using the three-level factorial design model, which fit well with the experimental data. The optimization results show that the best mass ratio of SCMs/HBC is 37.5% and that the best quality ratio of quartz sand/red mud is 9 under the curing conditions of 180 °C. However, the best mass ratio of SCMs/HBC is 49.3%, and the best quality ratio of quartz sand/red mud is 7 under 220 °C. With the addition of SCMs, the silicon-to-calcium ratio of HBC hydration products decreases, and high-temperature-stable xonotlite and tobermorite can be formed. After adding SCMs, the cement sample is denser without obvious cracks.

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A new route for separation and recovery of Fe, Al and Ti from red mud

Cited by 45 publications

References 28 publications

Extracting Al2O3 from red mud smelting separation slag based on mineral phase reconstruction

Extracting Al2O3 from red mud smelting separation slag based on mineral phase reconstruction

Red Mud as a Secondary Resource of Low-Grade Iron: A Global Perspective

Resource Utilization of Red Mud from the Solid Waste of Aluminum Industry Used in Geothermal Wells

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